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Digoxin-induced retinal degeneration depends on rhodopsin
Britta Landfried1, Marijana Samardzija1, Maya Barben1,2
1Lab for Retinal Cell Biology, Department of Ophthalmology, University of Zürich, Zürich, Switzerland.
Cell Death & Disease
|March 17, 2017
Summary
Digoxin causes vision loss by inducing photoreceptor cell death in mice, dependent on bleachable rhodopsin. This provides a new model for studying retinal degeneration.
Area of Science:
- Ophthalmology
- Cell Biology
- Neuroscience
Background:
- Na,K-ATPases are crucial for cellular ion homeostasis and retinal function.
- Cardiac glycosides, like digoxin, inhibit Na,K-ATPases, impacting cell function.
- Photoreceptor cells in the retina rely on Na,K-ATPases for light response.
Purpose of the Study:
- To investigate the effects of digoxin on retinal cells.
- To determine the mechanism of digoxin-induced retinal degeneration.
- To establish a novel model for studying retinal degeneration.
Main Methods:
- Treatment of wild-type and genetically modified mice with digoxin.
- Assessment of retinal cell survival and function.
- Analysis of gene expression and protein activation related to stress and inflammation.
Main Results:
- Digoxin caused severe retinal degeneration and vision loss in wild-type mice.
- Photoreceptor cell death was specific and dependent on bleachable rhodopsin.
- Digoxin activated stress signaling pathways and inflammatory genes.
Conclusions:
- Digoxin induces photoreceptor-specific cell death through a mechanism involving bleachable rhodopsin.
- This effect mimics light-induced photoreceptor degeneration.
- Digoxin treatment offers a new inducible model for studying retinal degeneration mechanisms.
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